package com.yupi.longojcodesandbox;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.resource.ResourceUtil;
import cn.hutool.dfa.WordTree;
import com.yupi.longojcodesandbox.model.ExecuteCodeRequest;
import com.yupi.longojcodesandbox.model.ExecuteCodeResponse;
import com.yupi.longojcodesandbox.model.ExecuteMessage;
import com.yupi.longojcodesandbox.model.JudgeInfo;
import com.yupi.longojcodesandbox.utils.ProcessUtils;
import org.apache.commons.lang3.StringUtils;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;

public class JavaNativeCodeSandboxOld implements CodeSandbox {

    private static final  String    GLOBAL_CODE_DIR_NAME="tmpCode";
    private static final String GLOBAL_JAVA_CLASS_NAME="Main.java";

    private static final Long  TIME_OUT=5000L;

    private static final List<String> blackList=Arrays.asList("File","exec");

    private static final WordTree WORD_TREE ;

    static {
        //初始化字典树
        WORD_TREE= new WordTree();
        WORD_TREE.addWords(blackList);
    }

    //测试
    public static void main(String[] args) {
        JavaNativeCodeSandboxOld javaNativeCodeSandboxOld = new JavaNativeCodeSandboxOld();
        ExecuteCodeRequest executeCodeRequest = new ExecuteCodeRequest();
        executeCodeRequest.setInputList(Arrays.asList("1 2","1 3"));
       // String code= ResourceUtil.readStr("testCode/simpleComputeArgs/Main.java",StandardCharsets.UTF_8);
        String code= ResourceUtil.readStr("testCode/unsafeCode/runFileError.java",StandardCharsets.UTF_8);
        executeCodeRequest.setCode(code);
        executeCodeRequest.setLanguage("java");
        ExecuteCodeResponse executeCodeResponse = javaNativeCodeSandboxOld.excuteCode(executeCodeRequest);
        System.out.println(executeCodeResponse);
    }
    @Override
    public ExecuteCodeResponse excuteCode(ExecuteCodeRequest executeCodeRequest) {
        List<String> inputList = executeCodeRequest.getInputList();
        String code = executeCodeRequest.getCode();

//        //校验代码中是否包含黑名单中的命令
//        FoundWord foundWord = WORD_TREE.matchWord(code);
//        if (StringUtils.isNotBlank(foundWord.getFoundWord())){
//            System.out.println(foundWord.getFoundWord());
//            return null;
//        }



        String language = executeCodeRequest.getLanguage();
        //todo 这个temCode文件夹是在longoj-bancked项目中
        String userDir = System.getProperty("user.dir");
        String globalCodePathName=userDir+ File.separator+GLOBAL_CODE_DIR_NAME;
        //判断全局代码目录是否存在
        if(!FileUtil.exist(globalCodePathName)){
            FileUtil.mkdir(globalCodePathName);
        }
        //把用户代码隔离存放
        String userCodeParentPath = globalCodePathName+File.separator+ UUID.randomUUID();
        String userCodePath = userCodeParentPath + File.separator + GLOBAL_JAVA_CLASS_NAME;
        File userCodeFile = FileUtil.writeString(code, userCodePath, StandardCharsets.UTF_8);

        //2.编译代码，得到class文件
        String compileCmd = String.format("javac -encoding utf-8 %s",userCodeFile.getAbsoluteFile());
        try {
            Process compileProcess = Runtime.getRuntime().exec(compileCmd);
            ExecuteMessage executeMessage = ProcessUtils.runProcessAndGetMessage(compileProcess, "编译");
            System.out.println(executeMessage);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }


        //3.执行代码，得到输出结果
        ArrayList<ExecuteMessage> executeMessagesList = new ArrayList<>();
        for (String inputArgs :
                inputList) {
            String runCmd= String.format("java -Xmx256m -Dfile.encoding=UTF-8 -cp %s Main %s",userCodeParentPath,inputArgs);
            try {
                Process runProcess = Runtime.getRuntime().exec(runCmd);
                //超时控制
                new Thread(()->
                {
                    try {
                        Thread.sleep(TIME_OUT);
                        System.out.println("超时了，中断！");
                        runProcess.destroy();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }).start();

                ExecuteMessage executeMessage = ProcessUtils.runProcessAndGetMessage(runProcess, "运行");
                System.out.println(executeMessage);
                executeMessagesList.add(executeMessage);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        //4.收集整理输出结果
        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
//        List<String> outputList = executeCodeResponse.getOutputList();
//        String message = executeCodeResponse.getMessage();
//        Integer status = executeCodeResponse.getStatus();
//        JudgeInfo judgeInfo = executeCodeResponse.getJudgeInfo();
        ArrayList<String> outputList = new ArrayList<>();
        //取用时最大值，方便判断是否超时
        long maxTime = 0;
        for (ExecuteMessage executeMessage : executeMessagesList) {
            String errorMessage = executeMessage.getErrorMessage();
            if (StringUtils.isNotBlank(errorMessage)){
                //用户提交的代码存在问题
                executeCodeResponse.setStatus(3);
                break;
            }
            outputList.add(executeMessage.getMessage());
            Long time = executeMessage.getTime();
            if (time!=null) {
                maxTime = Math.max(maxTime, time);
            }
        //正常运行完成
            if (outputList.size()==executeMessagesList.size()){
                executeCodeResponse.setStatus(1);
            }
            executeCodeResponse.setOutputList(outputList);
            JudgeInfo judgeInfo = new JudgeInfo();
            judgeInfo.setTime(maxTime);
            //memory要借助第三方工具，先不求
            executeCodeResponse.setJudgeInfo(judgeInfo);
        }


        //5.文件清理
        if (userCodeFile.getParentFile()!=null){
            boolean del = FileUtil.del(userCodeParentPath);
            System.out.println("删除"+(del ? "成功":"失败"));
        }

        return executeCodeResponse;
    }
    //6.错误处理，提示程序的健壮性
    //封装一个错误处理方法，当程序抛出异常时，直接返回错误响应
    private ExecuteCodeResponse getErrorResponse(Throwable e){
        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
        executeCodeResponse.setOutputList(new ArrayList<String>());
        executeCodeResponse.setMessage(e.getMessage());
        //表示代码沙箱错误
        executeCodeResponse.setStatus(2);
        executeCodeResponse.setJudgeInfo(new JudgeInfo());
        return executeCodeResponse;
    }
}
